Add user docs

README.md

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+# IFrame module
+
+## Introduction
+
+The iframe module provides an IFrame page type that allows you to embed an IFrame into a page without resorting to
+custom code.
+
+## Requirements
+
+ * SilverStripe 3.0
+
+## Installation
+
+Copy the iframe directory into your SilverStripe project, then append dev/build?flush=all to the website URL in your
+browser. e.g. http://mysite.com/dev/build?flush=all
+
+## Instructions
+
+For usage instructions see [user manual](docs/en/user.md).

docs/en/user.md

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+# IFrame usage
+
+This module provides a page type that you can use to embed IFrames in your website.
+
+## Creating an IFrame
+
+IFrame pages are created like any other page. When you create a new page, selected the **I Frame Page** from the list of
+available page types.
+
+There are a few new fields on an IFrame page.
+
+The most important is *Iframe URL*: this is the URL that wish you display inside the IFrame. This can be an absolute
+path (ie, http://example.com/) or a relative path (ie, /about-us/). If it is a relative path then it will be assumed to
+be from the root of your site (ie, http://mysite.com/about-us/).
+
+*Auto height* will change the height of the IFrame to match the total height of the remote page. This will only work if
+the remote page is hosted on the same domain.
+
+If you check *Auto width* the IFrame will take up the entire width of the content area that it is in.
+
+You can manually set the height and width with the *Fixed height* and *Fixed width* fields.
+
+The *Content* field has been broken up into three separate fields: one to display above the IFrame, one to display
+beneath the IFrame, and another to display instead of the IFrame if the user has disabled them.
+
+## Known Issues
+
+A common test case is to enter "http://google.com" as the IFrame URL. This won't work! Google's website has the
+*X-Frame-Options: SAMEORIGIN* header which means that it can only be displayed in an IFrame with a bit of technical
+hackery. If you experience a white box displaying with any other website, check if it has that option set in the
+header.